diff options
author | Andreas Schwab <schwab@linux-m68k.org> | 2013-09-07 18:35:08 +0200 |
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committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-09-10 02:49:46 +0200 |
commit | a857c0b9e24e39fe5be82451b65377795f9538d8 (patch) | |
tree | 9a1338d24be24c358b2fb00e4cfcc2a5fa6b5b6a /drivers/cpufreq/cpufreq.c | |
parent | 19c763031acb831a5ab9c1a701b7fedda073eb3f (diff) |
cpufreq: Fix wrong time unit conversion
The time spent by a CPU under a given frequency is stored in jiffies unit
in the cpu var cpufreq_stats_table->time_in_state[i], i being the index of
the frequency.
This is what is displayed in the following file on the right column:
cat /sys/devices/system/cpu/cpuX/cpufreq/stats/time_in_state
2301000 19835820
2300000 3172
[...]
Now cpufreq converts this jiffies unit delta to clock_t before returning it
to the user as in the above file. And that conversion is achieved using the API
cputime64_to_clock_t().
Although it accidentally works on traditional tick based cputime accounting, where
cputime_t maps directly to jiffies, it doesn't work with other types of cputime
accounting such as CONFIG_VIRT_CPU_ACCOUNTING_* where cputime_t can map to nsecs
or any granularity preffered by the architecture.
For example we get a buggy zero delta on full dyntick configurations:
cat /sys/devices/system/cpu/cpuX/cpufreq/stats/time_in_state
2301000 0
2300000 0
[...]
Fix this with using the proper jiffies_64_t to clock_t conversion.
Reported-and-tested-by: Carsten Emde <C.Emde@osadl.org>
Signed-off-by: Andreas Schwab <schwab@linux-m68k.org>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpufreq/cpufreq.c')
0 files changed, 0 insertions, 0 deletions